Albert was married and was apart from his wife for quite some time, ended up having a romantic relationship with his 1st cousin, Elsa, whom he later married after divorcing his first wife. Apparently his first relationship blew up...
If you don't know him, he was really creative and he's well known for his thoughts about "time" and theory of relativity and cool stuff that lead to... nuclear bombs... E=mc2.
Bonus: And would you marry your first cousin? I guess it happens sometimes...